1、Unit 2Healthy eatingDiscovering useful structuresDiscovering useful structures-Modal Verbs(II)Read the text again and pay attention to the sentences containing modal verbs and explain the meaning of the modal verbs.判断以下句子是否有错，并更正。1.He can speaks English.2.Could I have a look at your photos?3.Acciden
2、t can happen at any time.4.She ran fast but she isnt able to catch the bus.1.Then usually by lunchtime they would all be sold.2.What could have happened?3.Nothing could be better 4.Something terrible must have happened if 5.He could not believe his eyes.6.Perhaps he should go to the library and find
3、 out.PossibilityPossibilityPossibilityGuessingAbilityDuty7.He had better do some research!8.Even though her customers might get thin after eating Yong Huis food DutyPossibility1.ought to+动词原形He ought not to do it.=He oughtnt to do it.oughtnt to 不应该 had better 最好 should 应该 ought to 应该You ought to hel
4、p him because he is in trouble now.(语气强，有命令意味)You should have a rest after finishing your sports.（一般性建议）2.had better,should&ought tohave to 强调客观需要must 表示主观愿望、主观看法，Would you like to come to my house on National Day?Thanks,Id love to.But I have to see my uncle that day.3.have to&must dont/doesnt/didnt
5、 have to不必mustnt禁止，不允许We must finish the work before lunch.用作情态动词时，主要用于否定句和疑问句。1.用作情态动词You neednt telephone him now.I dont think you need worry.She dare not go out alone at night.How dare you say Im unfair?4.Dare“敢”&need“有必要，需要”2.用作实义动词时，可用于各种句式（need to do;dare to do）You dont need to do it yourself.
6、We need to tell them the news.We should dare to give our own opinion.He did not dare(to)look up.I dare say hell come again.（I dare say为固定习语）注意对need问句的回答:-Need I finish the work today?-Yes,_.No,_.No,_.you mustyou needntyou dont have toneednt 对其它情态动词的回答:-Shall I tell John about it?-No,you _.-No,you _.
7、-Must we do it now?-No,you _.-No,you _.needntdont have toneedntdont have to5.情态动词+have+过去分词1)may(might)have+done sth can(could)have+done sth表示过去，推测过去时间里可能发生的事情。Philip may(might)have been hurt seriously in the car accident.Philip can(could)have been hurt seriously in the car accident.2)must have+done
8、 sth对过去时间里可能发生的事情的推测，语气较强，具有“肯定”的意思。-Linda has gone to work,but her bicycle is still here.-She must have gone by bus.3)ought to have done sth should have done sth本应该做某事，而事实上并没有做。否定句表示“不该做某事而做了”。You ought to(should)have been more careful in this experiment.He ought not to have thrown the old clothes
9、away.（事实上已扔了。）ought to 在语气上比should 要强。4)neednt have done sth本没必要做某事I dressed very warmly for the trip,but I neednt have done so.The weather was hot.课堂巩固练习：DDACABAHomework完成 限时训练 P871.You _ your tooth pulled out before it rot completely.A.had better gotB.had to get better C.had better to getD.had bet
10、ter get2.When we got to the cinema,the film hasnt started yet,so we _.A.neednt hurryB.didnt need hurry C.neednt to hurry D.neednt have hurried3.It was really very dangerous;you _ him seriously.A.might have injuredB.could injure C.should have injuredD.must injureDDAPractice4.As he had heart attack,he
11、 was told that he _ continue the work.A.neednt B.may not C.mustntD.cant5.We ought to help each other in our work,_?A.oughtnt weB.should we C.shouldnt weD.ought to we6.Two eyes _see more than one.A.canB.mayC.willD.should7.When I got to the cinema,the film had already started;I_ there earlier.A.ought
12、to getB.ought to have got C.must have gotD.must getBAAC8.I thought you _ like something to read,so I have brought you some books.A.may B.might C.would D.must 9.Where is my pen?I _it.A.might lose B.would have lost C.should have lost D.must have lost 10.I didnt hear the phone.I _asleep A.must be B.mus
13、t have been C.should be D.should have beenBDB11.-There were already five people in the car,but they managed to take me as well.-It _ a comfortable journey.A.cant be B.shouldnt be C.mustnt have been D.couldnt have been 12.Its nearly seven oclock.Jack _ be here at any moment.A.must B.need C.should D.c
14、ouldDC13.-Did the train arrive in time?-No.It _ two hours ago.A.must have arrived B.ought to have arrived C.must arrive D.ought to arrive14.-Must I drive to his house and pick up the children?-No,.A.you shouldntB.you might not C.you neednt D.you mustntBC15.We didnt see Tom at the meeting yesterday.H
15、e it.A.mustnt have attended B.cannot have attendedC.neednt have attended D.would have not attendedB16.There is someone knocking at the door.it be Tom?A.Can B.Must C.Should D.Ought toA17.You _ take me to the station,and my brother is taking me.A.dont have to B.mustnt C.cant D.shouldnt18.Must I hand i
16、n the homework now?_.You can hand it in tomorrow morning.A.Yes,you must B.No,you neednt C.Yes,you need D.No,you mustntAB19.Mum,I climbed to the top of the shelf and got the Teddy Bear.My goodness!You may have hurt yourself.You _ do that again.A.dont have to B.may not C.neednt D.mustnt 20.Everybody is working hard.There _ be trouble in finishing the work on time.A.ought not to B.neednt C.mustnt D.ought to notDA
